simple calculator circui

Portable Magnetic Loop Antenna Version 2 - A simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres. For its size, the performance of the antenna always astounds me, although it is never going to replace a Yagi

W7AV 40 Meter Half Square - These antennas offer big gun DX performance on the low bands, yet they are surprisingly simple to build. Try one- you will like it!

Shorty Forty Antenna - Short dipole antenna for 40 meter ham band. Can be put up in the space required for a 20 meter dipole.

HF Bazooka antennas - French page with bazooka antenna design information and bazooka calculator

The DK7ZB-Match for Yagis - Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm.

Single Coil Z Match - Single Coil Z Match, circuit Diagram and homebrewing notes

G5RV Antenna Homebrew - Homebrew G5RV a simple multiband antenna by 9M2ZAK

DK7ZB 144 mhz Yagis - High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.

43.33 Km LOS with USB WiFi stick  ^{updated  pop} - Simple USB 802.11b WiFi adapter with original antenna test by adam 9A4QV.

Yogi Electronics - Yogi Electronics provides DTMF Control Simplex Repeater board.

Eliminate QRM from 6 meters band - The circuit described below will substantially reduce or completely eliminate interference from almost any local source whilst leaving the wanted signal relatively unaffected, even though it may be on the same frequencey by TREVOR, G3ZYY

Improving Heathkit SB-220 - Circuit Improvements for the Heath SB-220 Amplifier

Circuit Improvements for the TL-922 - by Richard L. Measures, AG6K

All American - Distributor of electronic components, ull range of semiconductors (active components), including relays, circuit breakers, transistors, diodes, memory devices, microprocessors, microcontrollers, and other integrated cuircuits, as well as passive components, such as capacitors, resistors, inductors, and electromechanical products, including cable, switches, connectors, filters, and sockets.

Yagi-Uda Array Calculator - Spreadsheet for the calculation of Yagi-Uda Array of Circular Loops. The website is in french, but the spreadsheet is both in English and French.

AntWave - Frequency to Wavelength Calculator - A simple frequency to wavelength converter program for Windows price

Javascript antenna calculations - Javascript online calculators for dipole 5/8 verticals with radials, and delta loop antennas

HL1INF RF Amplifiers - Circuits, pictures and data about toroids, tubes and home made power amplifiers

Heathkit SB-200 Modification - Tuned input circuit modification by Tom Boza - NE7X

DL5DBM 1KW amplifier for 144 Mhz - Pictures and circuit diagramm to build this power amplifier for 2 meters

DigChip IC database - Provider of electronic components documentation. Offer a reliable tool to find semiconductors components technical information like parts, datasheets, cross reference, obsolete and new circuits.

UHF dummy Load - A very simple and effective dummy load can be made from several resistors, a connector, and a small metal plate or piece of PC board stock.

Improvements for TS-830S - Circuit Improvements and Maintenance Procedures for the TS-830S

Circuit Improvements for the TS-430S - by Richard L. Measures, AG6K

50MHz-Transverter 10m/6m from DK7ZB - This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files